999987760 has 80 divisors (see below), whose sum is σ = 2362589856. Its totient is φ = 393580544.

The previous prime is 999987743. The next prime is 999987761. The reversal of 999987760 is 67789999.

999987760 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999987692 and 999987701.

It is not an unprimeable number, because it can be changed into a prime (999987761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1686024 + ... + 1686616.

Almost surely, 2^999987760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999987760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181294928).

999987760 is an abundant number, since it is smaller than the sum of its proper divisors (1362602096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999987760 is a wasteful number, since it uses less digits than its factorization.

999987760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910 (or 904 counting only the distinct ones).

The product of its (nonzero) digits is 15431472, while the sum is 64.

The square root of 999987760 is about 31622.5830696988. The cubic root of 999987760 is about 999.9959199834.

The spelling of 999987760 in words is "nine hundred ninety-nine million, nine hundred eighty-seven thousand, seven hundred sixty".